Instrument for recording and measuring vibrations.



PATENTED JULY 2, 1907.

J. SGH I ITTE. INSTRUMENT FOR RECORDING AND MEASURING VIBRATIONS.

APPLICATION FILED JUNE 14- 1904.

PATENT OFFICE.

JOHANN SGHUTTE, OF BREMERHAVEN, GERMANY.

INSTRUMENT FOR RECORDING AND MEASURING VIBRATIONS.

Specification of Letters Patent.

Patented July 2, 1907.

Application filed June 14,1904. Serial No. 212, 256.

To all whom it may concern:

Be it known that I, JOHANN SoHii'rTE, a subject of the German Emperor,residing at Bremerhaven, (free and hansa-town Bremen,) in the Empire ofGermany,

have invented certain new and useful Improvements in an Instrument forRecording and Measuring Vibrations, of which the following is a full,clear, and exact description.

This invention relates to apparatus for recording and measuring theoscillations of ships, railway vehicles, buildings, and the like, whichare exposed to vibrations, for which purpose the ordinary pendulum hasbeen used hitherto, the-comparatively heavy mass of which is suspendedby springs. Such a pendulum has the great disadvantage for exactexperiments, that it starts a swinging movement of its own which cannotsuch mass.

be distinguished with certainty from the oscillations with a measuringor recording device in such a manner that the 'relative motions of thismass as distinguished from the vibrations of the body to be examined,are recorded in consequence of the gyrostatic action of Therefore whilethe body, the oscillations of which are to be examined, for instance arailway vehicle, a ship or the like, is in motion, the quickly rotatingbody of the instrumentrernains at rest in consequence of the gyrostaticaction, so that by means of suitably interposed elements, the relativemovements of the body to be examined as distinct from the quicklyrotating swinging mass are recorded on a moving paper strip.

Instead of one rotary swinging mass a number may be employed, the axesof which are parallel to the three coordinate axes of space; thus itwill be possible to measure by an instrument constructed according tothis invention vertical oscillations as also transverse or longitudinaloscillations.

In order that this invention may be the better understood, I now proceedto describe the same with reference to the accompanying drawings and tothe letters and figures marked thereon.

Like letters refer to like parts 'in the various figures.

Figure 1 is a part sectional side view of the apparatus and Fig. 2 is apart sectional plan thereof on the line A-B of Fig. 1.

a is the base plate carrying a standard b on which is arranged a forkedarm d adapted to pivot on a pin a. The forked arm d carries three ringse, f and g arranged in the form of a gimbal joint. The ring 9 is pivotedat g to the ring 1' and the ring f is pivoted at f to the ring e. In theinner ring 9 is supported on an axle i,

a rotary swinging mass h. The fork d is supported in its horizontalposition by a spring k. A suitable recording pointer 11. is attached tothe ring 9 and works over a band or tape f as shown. When the disk It isrotated rapidly through any suitable means, such, for example, as anelectric motor diagrammatically shown at M and assuming that the baseplate a with the standard I) is situated on the body which vibrates forinstance vertically, the forked arm d on the pivot'c, will make pendulumoscillations which however are not followed by the gimbal jointedswinging mass in consequence of the gyrostatic action of the latter. A

marker or recording pointer connected with the inner frame g can thusrecordon the rotary drum 1 or on a continuous paper strip, the relativemovement of the forked arm d and consequently of the vibrating body asdistinct from the quickly rotating swinging mass it. A means forsupporting and operating the recording strip is shown in Fig. 1. Anadditional drum l is carried by an axle a resting in bearings bconnected to the bottom plate a. Reference letter 0 denotes the bearingsof the axle d of drum Z on which the recorder n is acting. A pulley e isfixedly mounted on shaft a and serves to give drum Z a rotatingmovement. The endless strip f is wound off from drum 1 and wound up bydrum Z, inconsequence of the rotation of this latter.

In the construction shown by way of example, the marker n is fixed tothe inner ring 9 but it may be equivalently arranged on one of the twoouter rings f and 8 instead. If the body to be examined vibrates in morethan one direction, one apparatus will be suiificient to measure andrecord these vibrations successively i. e. each separately, by placingthe apparatus successively into positions suitable for the indicating ofthe kind of oscillation to be measured at a time. However, the apparatusmay beconstructed so that the vibrations in different directions may berecorded and indicated simultaneously, for which purpose two forked armsmay be arranged on the standard b, each of such arms carrying a gimbaljointed swinging mass. For instance, a forked arm d pivoting on a pin 0,and shown only in part in the drawings may carry the second gimbaljointed swinging mass. A spring I) is designed to maintain the forkedarm d in its vertical position.

It will be understood that the gyroscope applied to the arm d issubstantially like that on the arm (1, and need not, therefore, be againdescribed in detail.

What I claim and desire to secure by Letters Patent is:

1. In an instrument for measuring and recording the vibrations of abody, a standard adapted to be fixed to the vibrating body. a forked armpivoted to said standard and spring supported therefrom so as tonormally lie in a horizontal position, gilnbal rings on the end of saidforked arm, a gyroscope supported thereby, a marker or recording pointerconnected to said gyroscope so as to indium the plane of rotationthereof, and a means for continuously moving a strip in the path of saidpointer. said means being supported by the vibrating body, whereby arecord of the vibrations of said body is made by tho I pointer.

2. In an instrument for measuring and recording the vibrations of abody, a standard fixed to the body. a forked arm pivoted to saidstandard and having a gyroscope connected thereto, a shaft for rotatingsaid gyroscope, a driving wheel supported by said standard and

